John mcdeemott



(No Model.) i v I J.'MODERMOTT-' I SHELL EXTRAGTOR. v No. 290,255. Patented Dec. 18. 1883.

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.- UNITE STATES P T NT OFFICE.

JOHN MODERMOTT, OF SAN v FRANCISCO, CALIFORNIA, ASSIGN OR TO GEORGE E. HARPHAM, OF SAME PLACE.

SHELL EXTRACTOR.

SPECIFICATION forming part of Letters Patent No. 290,255, dated December 18, 1883.

I Application filed March 14,1883. (N model.)

1" 0 (til whom it may concern): 7 For the extraction of exploded or corroded Be it known that I, JOHN MCDERMOTT, of shells in these guns, the body A of myexthe city and county of San Francisco, and intractor should be two and one-eighth inches the State of California, have" invented certain in length and the outside diameter should be .55

new and useful improvements in shell exthree-eighths of an inch, and the metal onetractors for the extraction of exploded or coreighth of an inch in thickness at the lower end. roded shells from breech-loading guns; and I It should be divided, from the top down to do hereby declare that the following is a full, within one-half inch of the bottom, into four clear, and exact description thereof, reference equal parts by slots H and H, of about one IO being had to the accompanying drawings, and sixty-fourth of an inch in width, except that to the letters of reference marked thereon, the lower part of the slots H for one inch making a part of this specification. should be one-eighth of an inch in width, to

My invention relates to the extraction of exadmit of the working up and down therein of ploded metal shells from breech-loading guns. the pin D. At the top of the body A, and ex- 1 1 It consists in a novel construction of certain tending the whole way around, except where devices or apparatus, in combination with the cut by the slots H and H, are placed one or ramrod of the gun, or other rod, for the purmore serrations, E, (three are shown in the pose of forcing exploded metal shells or cordrawings,andisthebest,)which are one-eighth roded shells out of the breech of the gun. For of an inch apart, and at the highest point are 2o guns using different-sized shells, differentonesixty-fourth of an inch higher than the sized extractors must be used. remainder of the body A, and slope down to Figure 1 shows a view of the center wedge the next row below. The interior diameter of of the shell-extractor with a spiral spring the body A, from the bottom up, for the first on it, and a sectional View of the body. Fig. half inch, should be one-eighth of an inch. 25 2 shows a side view of the shell-extractor. At thispoint the inte'riordiameteris increased Fig. 3 is a sectional view of the extractor on to six thirty-seconds of an inch. From this the plane X of Fig. 1. Fig. 4 is a sectional point the interior diameter should increase view of the extractor on the plane Y, Fig. 1. uniformly, until at the top the interior diame- Fig. 5 is a view of the center wedge. Fig. 6 ter is two -eighths of an inch. The center 0 is aview of the body of the extractor. wedge, B, is circular in form and two and one- Like letters have reference to the same parts. eighth inches in length. For the lower inch My shell-extractor is constructedof the cirthe diameter is uniform, and is seven sixtycular steel tube or body A, with one or more fourths of an inch. At a point aninch from serrations, (three to six is best,) E, running the bottom of the wedge B the diameter is in 3 5 entirely around the upper part, except where creased to three-sixteenths of an inch, so as to out by the slots H and H. A solid circular form a shoulder. From this point the diamesteel wedge, B, with the head F, tapering from ter increases uniformly to the head F which the head Fto just, below the pin D, and from is one-fourth of an inch long. The diameter 1 this point being somewhat smaller and of a of the wedge B where it joins the head F is 0 o uniform diameter to the end, is placed in the three-eighths of an inch. The head F is fourcenter of the body A. Upon the lower part teen'thirty-seconds of an inch in diameter. of the wedge B is placed a spiral spring, C, Upon the lower part of the wedge B is placed which can be dispensed with, if desired. A aspiral spring, C, of brass or other suitable pin, D, is run through the wedge B at the material, seven-eighths of an inch in length, 5 45 lower end of the tapering part. and fitting closely to the wedgeB, and adapted In a breech-loading gun where the metal to'work in the body A." It can be omitted, if 1 shells used are two and one-eighth inches in desired. The pin D should beabout seven length and one-half inch in exterior diameter sixty-fourths of an inch in diameter, and just at the top, and the metal is one sixty-fourth long enough to reach'to the outside of the rec 50 of an inch in thickness, the following is a debody A, passing. through the slots H, and scription of a shell extractor for such guns. passing through the center of the wedge 13 to before described, is dropped into the exploded cartridge-shell in the gun through the barrel, with the top toward the muzzle; or, if the end of the shell is blown off, it may be pushed up through the breech until it is within the exploded shell. The breech of the gun is then closed, and with the ramrod or other rod the wedge 13 is driven into the body A, forcing the upper ends, containing the serrations E, apart until the serrations E are either forced through the metal of the shell or firmly fastened therein. The breech is then opened, and by a few blows the shell is driven out of the gun. Two or three blows with the ramrod are usually sufficient to fix the serrations E of the extractor firmly enough in the shell, so that it can be driven out; but if the shell sticks very badly it may be necessary to force the serrations entirely through the shell. The serrations E should be as high, but never higher, than the thickness of the metal of the shell to be extracted, and the upper edge orend of the serration should be perpendicular to the body A. For guns carrying larger orsmaller shells the extractor should be proportionately in creased or reduced in size.

1 am aware that there is now in use a shellextractor consisting of a hollow steel tube cut into four equal parts to nearlythe bottom, and having a shoulder extending around the top, which is intended to catch the top of the shell,

and thus drive it out of the gun; but with this extractor it sometimes happens that in the discharge of the gun the top of the shell is forced so close to the barrel that the shoulder of the extractor will not catch on the shell, but slips through it, and the shell must be extracted by other means. \Vith my extractor this is impossible,as it works within the shell, and the wedge 15 in any case will force the serrations E of the body A into or entirely through the shell.

I do not desire to restrict myself to any particular number of rows of serrations at the top of the body A. I have shown three in the drawings, and consider that number to be the JOHN MCDERMOTT.

Witnesses:

H. A. Srncrmnn, M. W'ILBUR. 

